Demon

Demon is one of those bands that motors along, never really
achieving superstardom or worldwide fame (they are not well known
outside their native England) but quietly releases quality albums
that satisfy their loyal fan base.
They emerged at the peak of the NWOBHM movement in the early
80's, which is slightly misleading as most of their output is more in the
hard rock field, though their first two albums do show a bit of the
rougher, heavier NWOBHM style of the day.
Thirty-plus years into their career, they are still successful at what
they do.